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I wanted a temperature sensor that could handle the heat in my Texas attic and let me check the temperature before climbing inside. The SONOFF SNZB-02LD has worked well for that purpose, and it gives me historical data I can review on a dashboard.
My installation is straightforward. I leave the display outside the attic opening, run the probe cable into the attic, wrap the cable around a 2×4, and position the small metal probe inside. With the display below the attic, I can check the current reading before entering.
On the cloudy morning shown in my video, the display read 76.5 degrees. The historical graph showed the attic climbing above 110 degrees on hotter days. That variation was one reason I chose this sensor. I was concerned that other temperature sensors might not support the range I needed.
The product listing identifies the SNZB-02LD as a Zigbee sensor that requires a Zigbee hub. It also lists an LCD screen, a 1.5-meter 304 stainless steel probe, and a measurement range of -40°C to 115°C. According to the listing, the main unit is IP65 rated for resistance to water splashes. These are seller-provided specifications, not measurements or certification tests I performed myself.
The dashboard data has been the most useful part for me. I can view a daily temperature graph, zoom in by day, and compare the attic temperature pattern with the weather. This gives me a better picture of how sharply the temperature rises and falls than a single reading taken at a random time.
I have not experienced any data outages during the use described in the video, including while monitoring attic temperatures above 110 degrees. I described the readings as accurate in the video, but I did not compare them with a calibrated reference instrument. Based on my experience with this setup, the sensor has been reliable and has continued reporting through the high temperatures shown on my dashboard.
The SNZB-02LD makes the most sense if you need a remote metal probe, an immediate reading on an LCD screen, and historical temperature data through a compatible Zigbee setup. For my attic, it provides what I wanted: a reading I can check before going inside and temperature history I can review later.